Add beeswax, shea butter, jojoba oil, and castor oil to the top of the double boiler or glass bowl.
Heat over medium-high heat, stirring occasionally until completely melted.
Turn off the heat and whisk in the vitamin E oil, mica, and essential oils, if using.
Next, whisk in the glycerin if using, stirring vigorously.
Immediately pour the mixture into your containers.
Notes
You can store this in a roller bottle or increase the beeswax to 3/4 teaspoon and store it in a small, glass jar.
To infuse the lip balm with natural color try using alkanet root. I used 1 tsp ground alkanet root to 2 TBSP of carrier oil. Let it infuse in the top of a double boiler for 1 to 2 hours, then strain out the powder.